Cell Cycle and Cell Division

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Question
CBSEENBI11000113

Name the process in which there is an exchange of genetic material between non-sister chromatids of homologous chromsomes during meiosis.

Solution

Crossing over.

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Question
CBSEENBI11000114

What is polyteny ?

Solution

Polytene chromosomes are giant chromosomes which are formed due to repeated DNA replication without cell division. They are found in some insects. 

Question
CBSEENBI11000115

 Namethe five phases of of Prophase I.

Solution

The five phases of prophase 1 are
i. Leptotene
ii. Zygotene
iii. Pachytene
iv. Diplotene
v.  Diakinesis. 

Question
CBSEENBI11000116

 What are two types of cells on the basis of presence or absence of nucleus ?

Solution

On the basis of the presence and absence of nucleus the cells are divided into two types Eukaryotic and prokaryotic cells.